Cirrus Logic CS42L55 - Manual (Page 8)

8 DS773F1
CS42L55
1. PIN DESCRIPTIONS
Pin Name # Pin Description
SDIN 1 Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
LRCK 2
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data lines.
SDA 3 Serial Control Data (Input/Output) - Serial data for the I²C serial control port.
SCL 4 Serial Control Port Clock (Input) - Serial clock for the I²C serial control port.
VCP 5 Step-Down Charge Pump Power (Input) - Power supply for the step-down charge pump.
FLYP 6
Charge Pump Cap Positive Node (Output) - Positive node for the step-down charge pump’s flying
capacitor.
+VHPFILT 7
Step-Down Charge Pump Filter Connection (Output) - Power supply from the step-down charge
pump that provides the positive rail for the headphone and line amplifiers
FLYC 8
Charge Pump Cap Common Node (Output) - Common positive node for the step-down and inverting
charge pumps’ flying capacitors.
FLYN 9
Charge Pump Cap Negative Node (Output) - Negative node for the inverting charge pump’s flying
capacitor.
-VHPFILT 10
Inverting Charge Pump Filter Connection (Output) - Power supply from the inverting charge pump
that provides the negative rail for the headphone and line amplifiers.
HPOUTA
HPOUTB 11
13
Headphone Audio Output (Output) - The full-scale output level is specified in the HP Output Charac-
teristics specification table
HPREF 12 Pseudo Diff. Headphone Output Reference (Input) - Ground reference for the headphone amplifiers
LINEOUTA
LINEOUTB 14
16 Line Audio Output (Output) - The full-scale output level is specified in the Line Output Characteristics
specification table
LINEREF 15 Pseudo Diff. Line Output Reference (Input) - Ground reference for the line amplifiers.
8
7
6
3
1
9
2
4
5
10 11 12 13 14 15 18 17 16
19
26
20
21
22
23
24
25
27
35 28 29 30 31 32 33 34 36
VL
D
O
VDFILT VL MCLK SD
OUT
HPO
U
TA
HPR
E
F
HPO
U
T
B
LINEOUTA
LINEREF
VA
LINEOUT
B
LRCK
SDA
SCL
FLYP
HPD
E
TECT
RESET
+VHPFILT
AIN2A
AIN2B
AFILTA
AFILTB
FILT+
VQ
AIN2REF
VCP
SDIN
AGND
SCLK
FLYN
AIN1A
AIN1REF
AIN1B
FLYC
Top-Down (Through Package)
View
-VHPFILT
GND/Thermal Pad